Battery and battery module
By using a design in the insulating film of the square-shell battery that involves bending the main body and the first and second parts away from the casing and then hot-melting them together, the problem of corrosion between the insulating film and the casing is solved, thus improving the battery's reliability and corrosion resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-03-17
AI Technical Summary
In the prior art, there is an overlapping area at the joint of the insulating film at both ends of the prismatic battery, which makes it easy for gaps to appear between the metal casing and the insulating film, which in turn leads to corrosion and affects the reliability of the battery.
The main body of the insulating film is bent away from the shell and heat-fused together with the first and second parts to avoid the formation of gaps. The combination of the heat-fused layer and the adhesive layer improves the connection strength and ensures the sealing performance.
This effectively avoids gaps between the metal casing and the insulating film, improving battery reliability, preventing corrosion, and enhancing overall battery performance.
Smart Images
Figure CN224006100U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a battery and battery module. Background Technology
[0002] Square-shell batteries have a metal casing containing battery cells. During use, the metal casing is prone to electrical connection with external structures, causing short circuits. Therefore, an insulating film is typically wrapped around the outside of the metal casing to prevent short circuits. However, in existing technology, the ends of the insulating film overlap, forming an overlapping area with a first and second layer bonded together to prevent detachment. The root of the outer first insulating layer corresponds to the edge of the inner second insulating layer, with the root of the first insulating layer directly covering the metal casing and partially covering the inner layer of the overlapping area. Because the second insulating layer has a certain thickness, the root of the first insulating layer needs to be bent twice. Gaps can easily appear between this point and the metal casing, allowing moisture and electrolyte to seep in, corroding the surface of the metal casing and affecting battery reliability. Utility Model Content
[0003] One objective of this invention is to provide a battery whose metal casing is not easily corroded, resulting in higher battery reliability.
[0004] To achieve this objective, the present invention adopts the following technical solution:
[0005] Provide a battery,
[0006] include:
[0007] case;
[0008] An insulating film comprising a main body, a first part, and a second part, the main body being wrapped around and adhered to the outer side of the sidewall of the housing, the oppositely disposed first and second ends of the main body being sealed together, the first part being connected to the first end, the second part being connected to the second end, both the first part and the second part being bent relative to the main body in a direction away from the housing, at least the first root region of the first part connected to the main body and the second root region of the second part connected to the main body being adhered to and thermally fused together.
[0009] Optionally, both the first part and the second part have an insulating layer, a first adhesive layer and a hot melt layer stacked sequentially, wherein the melting point of the insulating layer is higher than the melting point of the hot melt layer, and the hot melt layer at the first root region and the hot melt layer at the second root region are hot-melted together.
[0010] Optionally, the insulating layer, the first adhesive layer, and the hot melt layer all extend to the entire area of the main body portion, and the main body portion further has a second adhesive layer sandwiched between the hot melt layer and the housing.
[0011] Optionally, the first part further includes an adhesive portion that extends beyond the edge of the second part and is adhered to the outer side of the main body.
[0012] Optionally, the first part and the second part are bent toward the side of the second part as a whole, with the first part wrapping around the side of the second part away from the housing.
[0013] Optionally, there is a transition surface between two adjacent sidewalls, and the first part and the second part are integrally disposed at the transition surface.
[0014] Optionally, the insulating film further includes a third part connected to the main body, the first part, and the second part, the third part extending to cover the bottom surface of the housing.
[0015] Optionally, the bottom surface has a first side and a second side, the first side being shorter than the second side, the short side of the third part wraps around the first side, the long side of the third part wraps around the second side, and the long side partially covers the outside of the short side.
[0016] Another objective of this invention is to provide a battery module whose metal casing is less susceptible to corrosion, resulting in higher battery reliability.
[0017] To achieve this objective, the present invention adopts the following technical solution:
[0018] A battery module is provided, including a module housing and the battery described above, wherein the battery is disposed within the module housing.
[0019] Optionally, the bottom surface of the housing is covered with a sealant layer, and the bottom surface is bonded to the inner wall of the module housing through the sealant layer.
[0020] The beneficial effects of this utility model are:
[0021] This invention provides a battery that avoids gaps between the insulating film and the casing by bonding the main body to the outer side wall of the casing and sealing the first and second ends together. Furthermore, the battery further enhances this by bending both the first and second parts away from the casing, with at least the first root region of the first part connecting to the main body and the second root region of the second part connecting to the main body being adhered to and thermally fused together. This provides a high connection strength between the first and second root regions of the first part, further preventing the sealing between the first and second ends from being affected when the first and / or second parts are under stress, thus ensuring no gaps between the insulating film and the casing. Moreover, this battery eliminates the need for overlapping areas of two insulating films, fundamentally avoiding the gap problem caused by overlapping installations. Therefore, the metal casing of this battery is less susceptible to corrosion, resulting in higher battery reliability.
[0022] This utility model also provides a battery module, including a module housing and the aforementioned battery, with the battery disposed inside the module housing. The metal casing of the battery in this battery module is less susceptible to corrosion, resulting in higher battery reliability. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;
[0024] Figure 2 This is a cross-sectional view of the battery (after the insulating film has been heat-fused) provided in an embodiment of this utility model;
[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;
[0026] Figure 4 This is a cross-sectional view of the battery (after the insulating film is bent) provided in an embodiment of this utility model;
[0027] Figure 5 yes Figure 4 Enlarged view of point B in the middle;
[0028] Figure 6 This is an exploded view of the insulating film provided in an embodiment of the present invention;
[0029] Figure 7 This is a schematic diagram of the structure of the battery (during the third wrapping process) provided in this embodiment of the present invention;
[0030] Figure 8 This is a schematic diagram of the structure of the battery (third part of the covering is completed) provided in the embodiment of this utility model.
[0031] In the picture:
[0032] 1. Shell; 11. Sidewall; 12. Transition surface; 13. Bottom surface;
[0033] 2. Insulating film; 21. Main body; 211. First end; 212. Second end; 22. First part; 221. Hot melt part; 2211. First root region; 222. Adhesive part; 23. Second part; 231. Second root region; 24. Third part; 241. Short side part; 242. Long side part; 240. Overlapping part; 201. Insulating layer; 202. First adhesive layer; 203. Hot melt layer; 204. Second adhesive layer;
[0034] 3. Sealant layer; 4. Insulating sheet. Detailed Implementation
[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.
[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0038] Square-shell batteries have a metal casing containing battery cells. During use, the metal casing is prone to electrical connection with external structures, causing short circuits. Therefore, an insulating film is typically wrapped around the outside of the metal casing to prevent short circuits. However, in existing technology, the ends of the insulating film overlap, forming an overlapping area with a first and second layer bonded together to prevent detachment. The root of the outer first insulating layer corresponds to the edge of the inner second insulating layer, with the root of the first insulating layer directly covering the metal casing and partially covering the inner layer of the overlapping area. The root of the first insulating layer requires a secondary bend, which can create gaps between it and the metal casing. This allows moisture and electrolyte to seep into the space between the insulating film and the metal casing, corroding the surface of the metal casing and affecting battery reliability.
[0039] Therefore, this embodiment provides a battery to solve the above problems. The metal casing 1 of this battery is not easily corroded, and the battery has higher reliability.
[0040] like Figures 1-8 As shown, the battery in this embodiment includes a casing 1 and an insulating film 2. The insulating film 2 includes a main body 21, a first part 22, and a second part 23. The main body 21 surrounds and adheres to the outside of the side wall 11 of the casing 1. The first end 211 and the second end 212 of the main body 21 are sealed together. The first part 22 is connected to the first end 211, and the second part 23 is connected to the second end 212. Both the first part 22 and the second part 23 are bent relative to the main body 21 in a direction away from the casing 1. At least the first root region 2211 of the first part 22 connected to the main body 21 and the second root region 231 of the second part 23 connected to the main body 21 are bonded together and thermally fused.
[0041] This battery avoids gaps between the insulating film 2 and the housing 1 by bonding the main body 21 of the insulating film 2 to the outer side wall 11 of the housing 1, with the first end 211 and the second end 212 sealed together. Furthermore, by bending both the first part 22 and the second part 23 away from the housing 1, and ensuring that at least the first root region 2211 of the first part 22 and the second root region 231 of the second part 23 are bonded together and thermally fused, the battery achieves a high connection strength. This further prevents the sealing of the first end 211 and the second end 212 from being affected by stress on the first part 22 and / or the second part 23, thus ensuring no gaps between the insulating film 2 and the housing 1. Moreover, this battery eliminates the need for overlapping areas of the two insulating films 2, fundamentally avoiding the gap problem caused by overlapping installations. Therefore, there is no gap between the metal casing 1 and the insulating film 2 of the battery, the casing 1 is not easily corroded, and the battery has higher reliability.
[0042] Optionally, both the first part 22 and the second part 23 have an insulating layer 201, a first adhesive layer 202, and a hot-melt layer 203 stacked sequentially. The first adhesive layer 202 is sandwiched between the insulating layer 201 and the hot-melt layer 203, that is, the insulating layer 201 and the hot-melt layer 203 are bonded together at the first part 22 and the second part 23. The melting point of the insulating layer 201 is higher than the melting point of the hot-melt layer 203, and the hot-melt layer 203 at the first root region 2211 and the hot-melt layer 203 at the second root region 231 are thermally fused together. Since the melting point of the insulating layer 201 is higher than that of the hot melt layer 203, during the hot melt process of the first root region 2211 and the second root region 231, the hot melt temperature can be controlled within a temperature range that is higher than the hot melt temperature of the hot melt layer 203 and lower than the hot melt temperature of the insulating layer 201. The hot melt process will not affect the insulating layer 201, ensuring that the insulating layer 201 does not deform or bend, and will not extend the deformation and bending to the first end 211 and the second end 212, thereby further ensuring the insulation effectiveness at the first end 211 and the second end 212.
[0043] like Figure 6 As shown, optionally, the insulating layer 201, the first adhesive layer 202, and the hot-melt layer 203 all extend to the entire area of the main body 21, that is, the insulating layer 201, the first adhesive layer 202, and the hot-melt layer 203 all surround the shell 1 to ensure that the insulating layer 201 and the hot-melt layer 203 are not easily separated from each other, and the hot-melt layer 203 is also not easily separated from the shell 1. The main body 21 also has a second adhesive layer 204, which is sandwiched between the hot-melt layer 203 and the shell 1, so that the main body 21 is adhered to and covers the shell 1, so as to ensure that the insulating film 2 can be firmly adhered to the shell 1 and is not easy to fall off.
[0044] like Figure 3 and Figure 5 As shown, optionally, the first part 22 includes a heat-melting part 221 and an adhesive part 222. The heat-melting part 221 is heat-melted to the second part 23, and the first root region 2211 belongs to the heat-melting part 221. The adhesive part 222 extends beyond the edge of the second part 23, that is, the first part 22 is longer than the second part 23, and the adhesive part 222 is bonded to the outer side of the main body part 21.
[0045] Optionally, in this embodiment, the first part 22 and the second part 23 are bent as a whole toward the second part 23. Figure 3 The images show the state of the first part 22 and the second part 23 after heat melting and before bending. Figure 5 The state of the first part 22 and the second part 23 after bending is shown. The first part 22 wraps around the side of the second part 23 away from the shell 1, and the first part 22 completely covers the second part 23. The part of the first part 22 that extends beyond the second part 23, namely the adhesive part 222, is pasted onto the main body part 21 to fix the bent state of the first part 22 and the second part 23.
[0046] like Figure 3 and Figure 4 As shown, optionally, a transition surface 12 is provided between two adjacent sidewalls 11 of the housing 1. The first part 22 and the second part 23 are integrally disposed at the transition surface 12, so that the space outside the transition surface 12 can accommodate the first part 22 and the second part 23, and the first part 22 and the second part 23 will not affect the arrangement of multiple batteries in the battery module. Furthermore, placing the first part 22 and the second part 23 in the space outside the transition surface 12 can also prevent the first part 22 and the second part 23 from protruding and wearing.
[0047] Optionally, the insulating film 2 also includes a third part 24, which is connected to the main body 21, the first part 22 and the second part 23. The third part 24 extends to cover the bottom surface 13 of the housing 1, so that the bottom surface 13 of the housing 1 can be insulated and protected by the third part 24.
[0048] Optionally, the dividing line between the main body 21 and the first part 22 extends along the height direction of the housing 1, with one end of the dividing line located at the top cover of the battery and the other end located at the edge of the third part 24. Optionally, the dividing line between the main body 21 and the second part 23 also extends along the height direction of the housing 1, with one end of the dividing line located at the top cover of the battery and the other end located at the edge of the third part 24.
[0049] Optionally, the third part 24 has at least an insulating layer 201 and a first adhesive layer 202, so that the insulating layer 201 is bonded to the bottom surface 13 of the housing 1. Optionally, in this embodiment, the third part 24 also has a hot-melt layer 203 and a second adhesive layer 204, that is, the insulating layer 201, the first adhesive layer 202, the hot-melt layer 203 and the second adhesive layer 204 are stacked sequentially, the insulating layer 201 is bonded to the hot-melt layer 203, and the hot-melt layer 203 is bonded to the housing 1. Optionally, in this embodiment, the insulating layer 201 of the third part 24 and the main body 21, the first part 22 and the second part 23 are the same layer, as are the first adhesive layer 202, the hot-melt layer 203 and the second adhesive layer 204. Optionally, the third part 24 can also be sealed at the joint by hot-melting the hot-melt layers 203 at both ends.
[0050] Figure 7 and Figure 8 The process of covering the bottom surface 13 of the third part 24 shell 1 is shown, in which Figure 7 This shows the case where the short side 241 of the third part 24 is covered, while the long side 242 is not covered. Figure 8 The diagram shows the situation after both the short side 241 and the long side 242 are covered.
[0051] Optionally, the bottom surface 13 has a first side and a second side, the first side being shorter than the second side. The short side 241 of the third part 24 wraps around the first side, and the long side 242 of the third part 24 wraps around the second side, with the long side 242 partially covering the outside of the short side 241. That is, in the process of the third part 24 actually covering the bottom surface 13, the short side 241 is first wrapped around the first side and the bottom surface 13 near the first side, and then the long side 242 is wrapped around the second side and the bottom surface 13 near the second side, with the long side 242 extending along its own width direction at both ends... Figure 7 The overlapping portion 240 will cover the short side portion 241. The contact area between the short side portion 241 and the bottom surface 13 of the housing 1 is small. This arrangement can maximize the contact area between the short side portion 241 and the bottom surface 13 of the housing 1. Furthermore, the long side portion 242 can further press down on the short side portion 241, thereby further reinforcing the short side portion 241.
[0052] Optionally, in this embodiment, the insulating layer 201 is made of PET (polyethylene terephthalate) or PA (polyamide) to ensure stable insulation properties, and the hot melt layer 203 is made of PP (polypropylene) to ensure that the hot melt temperature of the hot melt layer 203 is lower than that of the insulating layer 201.
[0053] Optionally, an insulating sheet 4 is provided at the top cover of the battery to provide insulation protection for the top cover of the battery, and the edge of the insulating sheet 4 is aligned with the insulating film 2.
[0054] This embodiment also provides a battery module, including a module housing and the aforementioned battery, with the battery disposed within the module housing. Optionally, multiple batteries are provided, and the multiple batteries are arranged sequentially along their own thickness direction.
[0055] Optionally, the bottom surface 13 of the housing 1 is covered with a sealant layer 3, and the bottom surface 13 is bonded to the inner wall of the module housing through the sealant layer 3. It is understood that the sealant layer 3 can also fully cover the bottom surface 13 of the housing 1, which helps to ensure the insulation characteristics of the bottom surface 13 of the battery.
[0056] The battery module has a high degree of reliability because the battery casing 1 and the insulating film 2 are less likely to have gaps, the metal casing 1 of the battery is less susceptible to corrosion, and the battery is more reliable.
[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A battery, characterized by, The application relates to a battery and a module shell. The battery comprises a shell (1) and an insulation film (2), the insulation film (2) comprises a main body part (21), a first part (22) and a second part (23), the main body part (21) is wrapped around and bonded to the outer side of a side wall (11) of the shell (1), the first end (211) and the second end (212) of the main body part (21) are sealingly connected, the first part (22) is connected to the first end (211), the second part (23) is connected to the second end (212), the first part (22) and the second part (23) are both bent towards the direction away from the shell (1) relative to the main body part (21), and the first root area (2211) of the main body part (21) connected with the first part (22) and the second root area (231) of the main body part (21) connected with the second part (23) are in close contact and hot melt connected. The first part (22) and the second part (23) both have an insulation layer (201), a first adhesive layer (202) and a hot melt layer (203) which are sequentially stacked, the melting point of the insulation layer (201) is higher than that of the hot melt layer (203), and the hot melt layer (203) at the first root area (2211) and the hot melt layer (203) at the second root area (231) are hot melt connected.
2. The battery of claim 1, wherein, The insulation layer (201), the first adhesive layer (202) and the hot melt layer (203) all extend to the whole area of the main body part (21), and the main body part (21) further has a second adhesive layer (204) which is arranged between the hot melt layer (203) and the shell (1).
3. The battery of claim 2, wherein, The first part (22) further comprises a bonding part (222) which exceeds the edge of the second part (23) and is bonded to the outer side of the main body part (21).
4. The battery according to any one of claims 1 to 3, characterized in that, The first part (22) and the second part (23) are integrally bent towards the side of the second part (23), and the first part (22) is wrapped on the side of the second part (23) away from the shell (1).
5. The battery of claim 4, wherein, The transition curved surface (12) is arranged between two adjacent side walls (11), and the first part (22) and the second part (23) are arranged at the transition curved surface (12).
6. The battery of claim 5, wherein, The insulation film (2) further comprises a third part (24) which is connected to the main body part (21), the first part (22) and the second part (23), and the third part (24) extends to wrap the bottom surface (13) of the shell (1).
7. The battery of any one of claims 1-3, wherein, The bottom surface (13) has a first edge and a second edge, the first edge is shorter than the second edge, the short edge part (241) of the third part (24) wraps the first edge, the long edge part (242) of the third part (24) wraps the second edge, and the long edge part (242) is partially wrapped on the outside of the short edge part (241).
8. The battery of claim 7, wherein, The application further relates to a module shell and a battery as claimed in any one of claims 1-8, and the battery is arranged in the module shell.
9. A battery module, characterized by 10. The battery module of claim 9, wherein, The bottom surface (13) of the shell (1) is covered with a sealant layer (3), and the bottom surface (13) is bonded to the inner wall of the module shell through the sealant layer (3).